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Table 2 The PSNR of denoising for images of different methods

From: The UDWT image denoising method based on the PDE model of a convexity-preserving diffusion function

Image

Noise variance

PSNR (dB)

Proposed

Noisy image

UDWT threshold

LLT

Y-K

Ref .[22]

Elaine

20

22.13

29.61

29.84

29.64

30.15

30.22

30

18.62

28.67

28.15

28.01

28.94

29.34

40

16.11

27.77

27.21

25.86

28.2

28.35

50

14.13

27.09

24.54

23.86

27.18

27.28

60

12.57

26.63

23.11

21.52

27.23

26.71

Tank

20

22.11

28.47

28.24

28.97

27.42

29.37

30

18.57

27.93

27.23

28.41

26.18

28.64

40

16.09

27.48

24.95

27.18

25.62

27.86

50

14.13

26.85

22.57

25.52

24.88

26.96

60

12.58

25.98

20.31

23.35

24.12

26.17

Sea

20

22.09

28.19

27.72

27.87

29.25

28.29

30

18.61

27.63

27.01

27.48

27.77

27.79

40

16.09

26.82

24.93

25.56

26.86

27.06

50

14.16

26.18

22.62

23.63

26.14

26.31

60

12.59

25.34

20.36

21.69

25.39

25.46

Plane

20

22.12

31.67

30.39

31.45

29.76

31.87

30

18.61

30.51

28.21

28.57

28.85

30.65

40

16.07

29.12

25.48

25.87

27.97

29.31

50

14.14

28.01

22.81

23.69

26.88

28.21

60

12.58

26.91

20.55

21.79

26.14

27.09

Panzer

20

22.12

25.17

26.72

26.78

23.47

26.81

30

18.61

24.91

26.11

26.38

22.04

26.39

40

16.08

24.71

24.25

24.61

21.24

25.86

50

14.14

24.51

22.19

22.84

20.64

25.29

60

12.57

24.31

20.19

21.26

20.1

24.73